Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Negative electrode for lithium ion battery, preparation method of negative electrode and lithium ion battery comprising negative electrode

A lithium-ion battery and negative electrode technology, which is applied to battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of high price, increased electrolyte cost, positive electrode damage, etc., and achieves easy preparation and improved performance. and service life

Pending Publication Date: 2022-08-05
NIO TECH ANHUI CO LTD
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Some of these film-forming additives will sacrifice other properties of the battery while optimizing the SEI film, or cause damage to the positive electrode.
At the same time, most of the film-forming additives are relatively expensive, adding film-forming additives to the electrolyte will also increase the cost of the electrolyte
In particular, the film-forming additives in the prior art are all added in the electrolyte, which can only improve the SEI film formed at the solid-liquid interface. The surface of the electrode is in sufficient contact with the electrolyte, and the parts inside the electrode where the electrolyte is not easy to enter will not be able to Therefore, the protective effect of the SEI film is greatly affected by the porosity of the electrode and the uniformity of electrolyte infiltration

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] S1: add an appropriate amount of deionized water in the mixing tank a, then add 1.2wt% (weight percent of all dry powders) sodium carboxymethyl cellulose and 0.2wt% (weight percent of all dry powders) LiNO 3 , stir until fully dissolved and evenly mixed;

[0029] S2: Add 95.6wt% of artificial graphite active material and 1wt% of conductive carbon fiber and conductive carbon black to another mixing tank b, mix well, and then pour the solution in S1 into mixing tank b, continue to stir;

[0030] S3: adding 2.0 wt% styrene-butadiene rubber emulsion to the suspension prepared in S2, and stirring for 30 min to prepare a negative electrode slurry;

[0031] S4: uniformly coat the negative electrode slurry prepared in S4 on the surface of the copper current collector, and dry to obtain a negative electrode pole piece.

Embodiment 2

[0033] S1: add an appropriate amount of deionized water in the mixing tank a, then add 1.2wt% (weight percent of all dry powders) sodium carboxymethyl cellulose and 0.5wt% (weight percent of all dry powders) negative electrode composition Film additive, additive by weight 1:1:1LiNO 3 / Li 2 CO 3 / Li 2 O preparation, stir until fully dissolved and mixed evenly;

[0034] S2: add 95.3wt% of artificial graphite active material and 1wt% of conductive carbon black to another slurry mixing tank b, mix well, then pour the solution in S1 into slurry mixing tank b, and continue to stir;

[0035] S3: adding 2.0 wt% styrene-butadiene rubber emulsion to the suspension prepared in S2, and stirring for 30 min to prepare a negative electrode slurry;

[0036] S4: uniformly coat the negative electrode slurry prepared in S3 on the surface of the copper current collector, and dry to obtain a negative electrode pole piece.

Embodiment 3

[0038] S1: add an appropriate amount of deionized water in the mixing tank a, then add 1.2wt% (weight percent of all dry powder weight) sodium carboxymethylcellulose, stir until fully dissolved and mix well;

[0039] S2: 95.3wt% artificial graphite active material and 1wt% conductive carbon black, 0.5wt% LiNO 3 Add them to another slurry mixing tank b together, mix them evenly, then pour the solution in S1 into the slurry mixing tank b, and continue to stir;

[0040] S3: adding 2.0 wt% styrene-butadiene rubber emulsion to the suspension prepared in S2, and stirring for 30 min to prepare a negative electrode slurry;

[0041] S4: uniformly coat the negative electrode slurry prepared in S4 on the surface of the copper current collector, and dry to obtain a negative electrode pole piece.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention relates to a negative electrode for a lithium ion battery comprising a film-forming additive contributing to the formation of an SEI film, said film-forming additive comprising lithium ions and having a solubility of less than 1 g lithium salt per 100 g organic solvent in one or more organic solvents selected from ethylene carbonate, propylene carbonate, diethyl carbonate, dimethyl carbonate or ethyl methyl carbonate.

Description

technical field [0001] The present invention relates to the field of lithium ion batteries, in particular to a negative electrode for lithium ion batteries, a preparation method thereof, and a lithium ion battery comprising the negative electrode. Background technique [0002] Lithium-ion batteries generally include cathodes, anodes, separators and electrolytes as the main devices for generating electrical energy. The anode is generally produced by coating the anode slurry on both sides of the copper foil current collector. The negative electrode slurry generally includes a negative electrode active material, a conductive agent, and a binder, which are uniformly stirred in deionized water in a weight ratio to form a negative electrode slurry. [0003] During the first charge and discharge of the liquid lithium-ion battery, the negative electrode material and the electrolyte react at the solid-liquid phase interface to form a passivation layer covering the surface of the neg...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01M4/62H01M4/13H01M4/133H01M10/0525
CPCH01M4/62H01M4/13H01M4/133H01M10/0525H01M2004/027Y02E60/10
Inventor 陈国孙振勇
Owner NIO TECH ANHUI CO LTD
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com